The invention discloses a load testing-analyzing method of a rotor compressor for a refrigeration plant. The load testing-analyzing method is characterized in that the amplitudes of two testing points are tested by an experiment, the finite element technology is utilized for calculating transfer matrixes of the displacement to all the testing points, caused by the force and moment on loading action points, and displacement matrixes of all the testing points, so that the loading value of the compressor can be obtained in a reversing manner. The loading value of the rotor compressor can be obtained by a simple and feasible testing method, so that the work stress of a pipe distribution structure can be analyzed and calculated conveniently.